The installation drawing should usually include panel layout, Terminal Wiring Diagram, panel wiring diagram, etc. . The main electrical lines of a substation include circuit breakers, transformers, buses and switchgear connected by circuit breakers, transformers, etc. . The main power supply line mainly reflects the basic structure and function of the substation. In operation, can indicate the distribution of substations, transmission relations and operation mode. On the master plan, the master wiring determines the substation, station equipment selection, relay protection configuration, distribution equipment layout and calculation, control mode and automatic settings. In addition, the electrical main line in the traction motor reliability, power quality, flexibility and economy play a decisive role, so it is the main part of the traction motor